Biology 301 - Wethey

 

Food Webs and Trophic Structure

 

Cedar Bog (Lindeman)

Lake Mendota (Juday)

Trophic Level

Productivity

Efficiency

Productivity

Efficiency

SolarRadiation

119,000

 

119,000

 

Plants

111

0.1 %

480

0.4 %

Herbivores

14.8

13.3 %

41.6

8.7 %

Carnivores

3.1

22.3 %

2.3

5.5 %

Higher Carnivores

   

0.3

13.0%

Global Productivity Patterns

Habitat

Net P (g m-2yr-1)

Biomass (g m-2)

Turnover Time (yr)

Tropical Forest

2200

45000

20.5

Temperate Forest

1200

30000

25

Tundra

140

600

4

Cultivated Land

650

1000

1.5

Marsh

2000

15000

7.5

Desert

90

700

7.8

Open Ocean

125

3

0.02

Algal Beds/Reefs

2500

2000

0.8

Estuaries

1500

1000

0.66

Lakes / Streams

250

20

0.08